WBUT 2013 Digital Electronics Question Paper (Paper code: BCA-101)

Bachelor in Computer Application

CS/BCA/SEM-1/BCA-101/2013-14

2013

DIGITAL ELECTRONICS

Time Allotted : 3 Hours                                              Full Marks : 70

The figures in the margin indicate full marks.

Candidates are required to give their answers in their own words

as far as practicable.

GROUP – A

(Multiple Choice Type Question)

1.       Choose the correct alternatives for the following:     10 x 1 = 10

          i)       Excess-3 code representation of decimal 984 is

                   a)      1011 1010 1101              b)      1100 1011 0111

                   c)      1110 1001 1010             d)      1101 1111 0111

          ii)      Hexadecimal equivalent of (1586)10  is

                   a)      (362)16                          b)      (623)16

                   c)      (632)16                          d)      (263)16

          iii)     2’s complement of 1010111 is

                   a)      0101001                        b)      0110110

                   c)      0101100                        d)      0101101

          iv)     A function of three variables

                   FA, B, C=(1, 3, 5, 6) is given by

                   a)      an 8-to-1 multiplexer

                   b)      two 4-to-1 multiplexer

                   c)      one 4-to-1 multiplexer

                   d)      none of these.

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